Heat radiator



May 6, 1930. A. F. H. LINDSTROM ET AL 1,757,534

HEAT RADIATOR Filed Nov. 14, 1927 Patented May 6, 1930 UNITED STATES PATENT OFFICE ARTHUR rnnnnrx HILMEB LmnsrnoM AND CARL DANIEL snennsrnoivr, or nsxrnsruna, SWEDEN HEAT RADIATOR Application filed November 14, 1927, Serial No. 233,267, and in Sweden November 19, 1926.

This invention relates to radiators of sheet metal for the interchange of heat between mediums. In radiators of this type each section or element generally consists of two plates provided with one or more longitudinal curve-shaped bends, which plates are connected at the edges by welding or in any Other manner and provided at their top and lower ends with connection sockets. The object of the invention is to increase the heat transmitting surface of the elements, so that the elements become more effective. This may be efiected in a simple manner by ex tending outwards from the element the longltudinal edge portions of the plates and bending the same from each other, and in addition hereto one or more outwardly extending plate strips may be fixed between the said edge portions in order to increase still more the said surface.

Fig. 1 in the accompanying drawing shows in a side view a radiator of sheet metal and 1 arranged in accordance with the invention.

Fig. 2 is an end view of the same. Fig. 3 is a cross section of one of the elements along the line 13-13 in Fig. 2 and on a greater scale. Fig. 4 is a similar section of an element arranged in accordance with a modified form of the invention.

Each element 1 of the radiator shown in Figs. 1, 2 and 3 as an example of the execution of the invention comprises two plates 2 and 3, each provided with two outwardly projecting bends t, 5 and 6, 7 respectively 5 which are curve-shaped in cross section and constitute two channels 8 and 9 for the heating medium, communicating with one another through a passage 10 at the centre of the element. The said plates are connected to one another at their edge portions for instance by welding, and are provided at their top and bottom ends with sockets 11 and 12, through which the elements communicate with each other in the ordinary manner. In 4.3 order now to increase the heating surface of the element the edge portions of the plates are extended laterally. The extensions are desig nated by 13 and 14: and to the same is imparted for instance the shape shown in Fig. 3

i. e. the extensions are bent outwards to a curve-shape, so that they correspond substantially to the half of the curvatures respectively of the plates. In the form of execution shown in Fig. 4 strips 15 of sheet metal are fixed by welding, between the edges of the plates 2 and 3, which strips extend vertically along the element and outwards into the spaces between the extensions 13 and 1a in substantially the same degree as the extensions. The edges of the extensions and of the plate strips are turned bacli.

As a heating medium passes through the element the heat is spread outwards in the extensions 13 and 14 and also the strips 15 and owing to the fact that both sides of the extensions and the strips respectively emit heat the total heat emitting surface of the element is substantially doubled through the additions 13, 14 and 15. Experiments made also have proved that radiators arranged in accordance with the invention have an efiect exceedingly increased.

The invention may evidently be modified in some respects without departing from the idea on which it is based.

We claim:

1. A radiator for the interchange of heat between mediums comprising a plurality of transversely disposed elements each of which consists of two plates connected together adjacent their edges to provide a passage for one of the mediums, the opposed and free marginal edge portion of the plates being extended outwardly and separate from each other so that both sides of the extensions constitute heat transmitting surfaces for the purpose of increasing the heating effect of the element and the heat transmitting'surface thereof.

2. A radiator according to claim 1, wherein outwardly extending strips of sheet metal are fixed between the opposite edge portion of each element for further increasing the heat transmitting surface thereof.

In testimony whereof we have hereunto affixed our signatures.

ARTHUR FREDRIK l'llLMliR LINDSTRQM. CARL DANIEL SEGERSTRGM. 

